New topend still smokin

1 reply to this topic
  • tullymars

Posted March 20, 2005 - 05:57 PM


I just put a new piston in,and had a valve job done on my 94 650L,now after about 100 miles its smoking,its the worse when its cold and you first fire it up,like the valve giudes are bad...but they checked out ok.Gets better after it warms up...but still smokes slightly.Only has about 140lbs. compression which seems low for a fresh bore and 10:25-1 conpression ratio.Pulled it back apart,no hot spots on the head gasket,ring end gap was good,never checked the clearence between piston and cylinder,but I did messure the bore after it was done,657cc = 101mm,it meassured 100.976mm,thats about as good as gets.Anybody got any idea?I would appreciate any input.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • hoptup

Posted March 20, 2005 - 06:41 PM


Valve guides.

Related Content


Honda XR650L 2017 by Chris.GVS

Honda XR650L 2017
  • - - - - -
  • 0 reviews

93 xr650l Restoration Project by Zigster

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 17 replies

Cle Elum Sunday 5/29: Looking for dual sport tips by TigerTanker

Dirt Bike   Dirt Bike Regional Discussion   Northwest
  • Hot  32 replies

Post Apocalypse, ThumperTalk style! by Justin Pearson

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  35 replies

Fell Off Trailer by usafxr

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  43 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.